package com.atguigu.educenter.controller;

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.atguigu.utils.HttpClientUtils;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @Author: LDeng
 * @Date: 2020-09-10 13:26
 */
@Controller
@CrossOrigin
@RequestMapping("/api/ucenter/wx")

public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    /**
     * 生成微信扫描二维码
     */
    @GetMapping("login")
    public String getWxCode() {
        //请求微信地址 固定地址+拼接参数
//        String url="https://api.weixin.qq.com/" +
//                "connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+
//                "&response_type=code";
        // 微信开放平台授权baseUrl  %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        //设置%s里面值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                //ConstantWxUtils.WX_OPEN_REDIRECT_URL,
                redirectUrl,
                "atguigu"
        );
        //重定向到请求微信地址
        return "redirect:" + url;
    }

    /**
     * 2,获取扫描人信息，添加数据
     */
    @GetMapping("callback")
    public String callback(String code, String state) {
        try { //1， 获取code
            //2, 拿code 请求固定地址， 得到access_token和openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接id 密钥和code
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );
            //请求拼接好的地址，得到返回的access_token和openid
            //使用httpClient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //accessTokenInfo 里面获取access_token 和open_id
            //方法一 ， 分割字符串取值
            //方法二，JSON字符串转Map, keyvalue 取值  使用GSON转换
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String) mapAccessToken.get("access_token");
            String openid = (String) mapAccessToken.get("openid");


            //判断数据库表里面是否存在用户信息
            UcenterMember member = memberService.getMemberByOpenId(openid);
            //用户不存在, 添加用户
            if (member == null) {
                //将扫码人信息加入数据库
                //3, 拿着 access_token 和openid 请求固定地址， 获取扫码人的信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //httpclient 发送http 请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                //获取扫码人的信息变成MAP, 并获取昵称和头像
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userInfoMap.get("nickname");
                String headimgurl = (String) userInfoMap.get("headimgurl");

                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串，通过路径传递token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            return "redirect:http://localhost:3000?token=" + jwtToken;
        } catch (Exception e) {
            throw new GuliException(20001, "扫码异常，登录失败");
        }


    }
}
